Pearson, PN (22 april 2000). ”Atmospheric carbon dioxide concentrations over the past 60 million years”. Nature "406" (6797): ss. 695–699. doi:10.1038/35021000. PMID 10963587.
Hegerl, Gabriele C.; et al. (22 april 2007). ”Understanding and Attributing Climate Change” (PDF). Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. IPCC. Arkiverad från originalet den 8 maj 2018. https://web.archive.org/web/20180508152907/http://www.ipcc.ch/pdf/assessment-report/ar4/wg1/ar4-wg1-chapter9.pdf. Läst 26 juni 2010. ”Recent estimates indicate a relatively small combined effect of natural forcings on the global mean temperature evolution of the second half of the 20th century, with a small net cooling from the combined effects of solar and volcanic forcings.”
IPCC (2007). ”Chapter 1: Historical Overview of Climate Change Science” (PDF). Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. IPCC. sid. p97 (PDF page 5 of 36). Arkiverad från originalet den 26 november 2018. https://web.archive.org/web/20181126204443/http://www.ipcc.ch/pdf/assessment-report/ar4/wg1/ar4-wg1-chapter1.pdf. Läst 10 februari 2010. ”To emit 240 W m–2, a surface would have to have a temperature of around −19 °C. This is much colder than the conditions that actually exist at the Earth’s surface (the global mean surface temperature is about 14 °C). Instead, the necessary −19 °C is found at an altitude about 5 km above the surface.”
Pearson, PN (22 april 2000). ”Atmospheric carbon dioxide concentrations over the past 60 million years”. Nature "406" (6797): ss. 695–699. doi:10.1038/35021000. PMID 10963587.
Hegerl, Gabriele C.; et al. (22 april 2007). ”Understanding and Attributing Climate Change” (PDF). Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. IPCC. Arkiverad från originalet den 8 maj 2018. https://web.archive.org/web/20180508152907/http://www.ipcc.ch/pdf/assessment-report/ar4/wg1/ar4-wg1-chapter9.pdf. Läst 26 juni 2010. ”Recent estimates indicate a relatively small combined effect of natural forcings on the global mean temperature evolution of the second half of the 20th century, with a small net cooling from the combined effects of solar and volcanic forcings.”
IPCC (2007). ”Chapter 1: Historical Overview of Climate Change Science” (PDF). Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. IPCC. sid. p97 (PDF page 5 of 36). Arkiverad från originalet den 26 november 2018. https://web.archive.org/web/20181126204443/http://www.ipcc.ch/pdf/assessment-report/ar4/wg1/ar4-wg1-chapter1.pdf. Läst 10 februari 2010. ”To emit 240 W m–2, a surface would have to have a temperature of around −19 °C. This is much colder than the conditions that actually exist at the Earth’s surface (the global mean surface temperature is about 14 °C). Instead, the necessary −19 °C is found at an altitude about 5 km above the surface.”
